Blackmax
BlackMAX® is a cost-effective alternative to rigid stormwater drainage pipes providing exceptional performance and durability. Manufactured from polypropylene, BlackMAX® pipes are resistant to corrosive and aggressive ground conditions, such as acid sulphate soils or saline ground waters; resulting in increased longevity of the pipeline.
Material Properties
| Property | Value & Unit |
| Density | 900 kg/m³ |
| Design Stress | 17.5 MPa |
| Ultimate Tensile Strength | 28.0 MPa |
| Ring Bending Modulus | 1300 MPa |
| Tensile Modulus | 3000 MPa |
| Poisson’s Ratio | 0.45 |
| Property | Value & Unit |
| Max Continuous Service Temperature | 50°C |
| Specific Heat | 1045 J/kg.K |
| Thermal Conductivity | 0.138 – 0.150 W/m.K |
| Coefficient of Thermal Expansion | 7 x 10-5 / °C |
| Vicat Softening Temperature | >79°C |
Polypropylene is inherently resistant to a wide range of chemicals such as acids, alkalis, salts, wetting agents and alcohols. It is however attacked by oxidising acids such as fuming nitric acid or hot concentrated sulphuric acid, neither of which should be encountered in a drain. Polypropylene is swollen and softened by halogenated solvents (for example, trichlorethylene) and hydro-carbon solvents such as xylene and benzene. However, the effect is not immediate and the occasional contact with solvents such as petrol or diesel is acceptable for PP pipes used for drainage and sewerage applications.
SBR seals are also resistant to a wide range of chemicals such as salt solutions, alkalis, glycols and some alcohols. SBR is swollen by a number of organic solvents, however, the seals are encapsulated in the pipe profile and to a large extent, isolated from the contents of the pipe. As only a small part of the seal surface is in contact with liquid in the pipeline, any occasional spillages or illegal dumping of chemicals should have a minimal effect.